ICD-10 code for vein agenesis

The ICD-10-CM code for vein agenesis is Q27.9 (Congenital malformation of peripheral vascular system, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Q27.9.

Within Q27, choose Q27.9 (Congenital malformation of peripheral vascular system, unspecified) only when documentation doesn't support a more specific option: congenital absence and hypoplasia of umbilical artery (Q27.0), congenital renal artery stenosis (Q27.1), other congenital malformations of renal artery (Q27.2), arteriovenous malformation (peripheral) (Q27.3), congenital phlebectasia (Q27.4) and other specified congenital malformations of peripheral vascular system (Q27.8).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 299 (Peripheral Vascular Disorders with MCC, relative weight 1.5842), DRG 300 (Peripheral Vascular Disorders with CC, relative weight 1.0464) and DRG 301 (Peripheral Vascular Disorders without CC/MCC, relative weight 0.7133), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.